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Charge-transfer excitons in strongly coupled organic semiconductors

Abstract : Time-resolved and temperature-dependent photoluminescence measurements on one-dimensional sexithiophene lattices reveal intrinsic branching of photoexcitations to two distinct species: self-trapped excitons and dark charge-transfer excitons (CTXs; ≳5% yield), with radii spanning 2–3 sites. The significant charge-transfer exciton (CTX) yield results from the strong charge-transfer character of the Frenkel exciton band due to the large free-exciton bandwidth (∼400 meV) in these supramolecular nanostructures.
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Submitted on : Sunday, September 13, 2015 - 2:30:04 PM
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Jean-François Glowe, Mathieu Perrin, David Beljonne, Sophia C. Hayes, Fabrice Gardebien, et al.. Charge-transfer excitons in strongly coupled organic semiconductors. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2010, 81 (4), pp.041201. ⟨10.1103/PhysRevB.81.041201⟩. ⟨hal-01198470⟩



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